I think many with ADHD have been mentally abused by people thinking that they were just lazy. I was diagnosed with depression most of my life due to people like that, then suddenly medication magically fixed almost all of those problems and I haven't been that depressed since I got diagnosed and got the medicine.

I'm not saying that we should attack people like that, I'm just explaining why it would induce anger in some so you'd understand better where he comes from.